基于SEEP/W的衬砌渠道非饱和渗流模拟

Simulation of unsaturated seepage in lining canal based on SEEP/W

基于有限元软件SEEP/W建立了二维渠道模型,用以观察通过渠道底部和侧面下方土壤的渗流变化。本文通过观测土体孔隙水压力(PWP)的变化,间接地研究了土体的渗流变化。比较了有衬砌和无衬砌渠道在不同水头下的渗流损失。研究表明:PWP随土壤含水量的变化而变化,饱和土的PWP为正值,而非饱和土的PWP为负值;水头对压水压力的变化影响较大;同时,在渠道表面应用防渗层可以减少渗漏损失,高负压水压也证实了这一点。

SEEP/W software based on finite element was used to build a two-dimensional canal model to observe the change of seepage through the soil under the bottom and side of the channel.In this paper,by observing the change of pore water pressure(PWP),the change of soil seepage is studied indirectly.The seepage losses of lined and unlined canals under different water heads were compared.The results show that:PWP varies with the change of soil water content,the PWP of saturated soil is positive,while that of unsaturated soil is negative;the water head has a great influence on the change of water pressure.At the same time,the application of impervious layer on the surface of canal can reduce the leakage loss,which is also confirmed by high negative pressure.